Paper can only be recycled 3 times, because the fibers get shorter and weaker each time the paper is recycled.
Glow for it
Glow for it Cells can now be made to glow in any colour thanks
to the discovery of six glowing proteins from brightly coloured
corals in reefs off the coasts of Southeast Asia. These spectacular
light shows will enable biologists to observe genes at work by
labelling each one with a different colour. 2 OCTOBER 1999, P. 10
Cool Articles
